Kinetic and thermodynamic aspects of U(VI) and Th(IV) sorption on a zeolitic volcanic tuff

Removal of U(VI) from aqueous media by hydrothermal cross-linking chitosan with phosphate group

“…Above all, HCC-TPP presents a novel, promising and feasible alternative adsorbent for uranium removal compared with other reported adsorbents [8,[41][42][43][44][45][46][47][48][49][50][51], as showed in Table 5. Although direct comparison of HCC-TPP with other adsorbents is very difficult owing to different experimental conditions, it could be concluded that U(VI) sorption capacity of HCC-TPP is superior to polyacrylamide-bentonite, diethylenetriamine-modified magnetic chitosan resins and thermally activated sodium feldspar.…”

Solid phase extraction using silica gel modified with azo-dyes derivative for preconcentration and separation of Th(IV) ions from aqueous solutions

“…, Th(OH) 3 ? , and Th(OH) 4 . The solution pH increases the solubility of thorium is significantly reduced.…”

“…The interaction of Th(IV) with the adsorbent may take place through complex formation with the nitrogen and oxygen atoms of the adsorbent. The formation of Th(OH) 4 precipitate results in significant decrease in the adsorption of Th(IV) on SiCPMS-L adsorbent. As a result of the collapse of Th(OH) 4 molecule, a significant decrease was observed in the adsorption of Th(IV) ion onto SiCPMS-L.…”

“…Thorium, which is extremely mobile and once entered living bodies will provoke inner irradiation, is widely applied to various fields, such as catalysts, functional material, agriculture, aeronautics and aerospace, especially in nuclear energy [3,4]. Also, thorium in natural water has cumulative effect to marine organism, which is harmful to aquatic plants and animals [5].…”

Flow-Injection Potentiometry by Poly(vinyl chloride)-Membrane Electrodes with Diphosphoryl-dicarboxylicacid-p-tert-butylcalix[4] arene Ionophore for the Determination of Th(IV) Ions

“…1 However, thorium is a toxic heavy metal that is extremely mobile, and once having entered living bodies will provoke inner irradiation (especially due to γ-active decay products), having as a final result the appearance of cancer. 2 Also, thorium and its compounds are hazardous, causing environmental problems. In view of the extensive application, toxicity, and hazard, the development of reliable methods for the separation, monitoring, and recovery of thorium in environmental and geological samples is of particular significance.…”